Male Qi and Blood deficiency is nearly always due to Spleen Qi deficiency that is failing to produce sufficient post-heavenly Qi and this lack of nourishment reduces a man’s fertility. An example of this is that Type II diabetes (a Spleen deficiency pattern) is linked to lower volumes of seminal fluid and higher rates of DNA fragmentation.i
The Spleen has an important role in the production of Qi, Yin and Blood and it ultimately supports reserves of Kidney Jing, which makes supporting Spleen Qi and nourishing Blood an important consideration for all men with deficiency patterns, and will be the central treatment principle for many men. Alternative causes of Qi and Blood deficiency are chronic overwork, poor diet or from chronic blood loss (possibly in the intestines).
i “Insulin dependant diabetes mellitus: implications for male reproductive function” Agbaje et al. Hum. Reprod. (2007) 22 (7): 1871-1877.
ii Thanks to Steve Clancy’s “Notes on the treatment of male infertility” JCM; No73. Oct 2003 p46-50
iii By Zhang Jing-Yue in Jing Yue Quan Shu Ch 50-51.